When there are pilot complaints of heavy aileron input forces, or when the aileron steering wheel does not come back to neutral very smoothly, often the bearings inside the LH aileron input quadrants in the wheel well are dirty or corroded and may be saturated with moisture, causing them to freeze-up in the air.
The only permanent solution is to replace the complete input assy.
But as there are not always spare parts, you can temporarily fix this problem by lubricating the bearings with some WD40 or a similar product. Then cover the bearings with some grease 16 or 7 to prevent ingestion of moisture and dirt. This action will almost certainly make the steering input light and smoothly for a short period of time, just enough to plan the a/c for a maintenance visit to replace the parts.
Of course do this according to your own company policies and rules.
See both pictures of these input quadrants and the spots where to lubricate them.
